we get to see the role technology played in this investigation. this video comes from the state police helicopter, it shows the final tense moments of the man hunt. stun grenades exploding as police move in to capture 19-year-old dzhokhar tsarnaev. the pictures show that, as the 19-year-old steps out of the boat, police make their arrest and they're providing him medical care right there on the scene. >> those pictures that's a stun grenade going off right there, it's extraordinary, there were three of them used. let me ask you about dzhokhar tsarnaev, what kind of condition is he in right now and when will police be able to question him? >> reporter: dan, he's listed in serious, but stable condition here at beth israel hospital. because of his injuries, authorities have not been able to interview him. but a special federal interrogation team is on standby the moment he is able to. and dan, i think it's worth noting that the suspected killer is being treated at the same hospital where many of the victims of monday's blast were also treated. >> it'